Found in a tomb in Hubei, China in 1965, the sword of Goujian is a relic that dates back to a time between 771 and 403 BC. It belonged to Goujian, a famous emperor who apparently took back his kingdom a decade after it fell to a neighboring state. Upon it’s discovery, archaeologists were shocked to find that even though it had been in the tomb for thousands of years, there was no trace of serious wear on the blade which was still very sharp. In addition, there was no tarnish or rust on it which is especially odd considering it’s made up of tin and copper and the crypt was soaked in water from the Zhang River the entire time. Today, it rests in the Hubei Provincial Museum still sharp.